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Display device to prevent a cathode electrode from being shorted

a display device and cathode electrode technology, applied in the field of display devices, can solve the problems of inorganic film damage, organic film b>3/b>/i>b/i> overflow, and light-emitting diodes are likely to be degraded

Active Publication Date: 2021-07-13
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]An aspect of the present disclosure is to provide a display device that may prevent an inorganic film formed in an organic film open area from being damaged.
[0018]Another aspect of the present disclosure is to provide a display device that may prevent a cathode electrode from being shorted in an organic film open area.

Problems solved by technology

The light emitting diode has a problem in that the light emitting diode is likely to be degraded due to external factors such as external water and oxygen.
Since the organic film 3b has flexibility until the hardening process is performed, a problem may occur in that the organic film 3b may overflow outside an area where the encapsulation film 3 is to be formed.
Since the inorganic film formed on the metal patterns is thinly formed, the inorganic film may be damaged during the manufacturing process.
Particularly, the inorganic film is formed more thinly in an area where a step difference is generated by the contact hole, whereby a crack may occur.
At this time, if the cathode electrode is formed on the inorganic film in which a crack occurs, a defect may occur in that the metal patterns and the cathode electrode may be shorted or interfere with each other.

Method used

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  • Display device to prevent a cathode electrode from being shorted
  • Display device to prevent a cathode electrode from being shorted
  • Display device to prevent a cathode electrode from being shorted

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0097]FIG. 4 is a detailed plane view illustrating a first embodiment of a non-display area of FIG. 2, FIG. 5 is a cross-sectional view illustrating an example taken along line I-I′ of FIG. 4, and FIG. 6 is a cross-sectional view illustrating another example taken along line I-I′ of FIG. 5.

[0098]Referring to FIGS. 4 and 5, a compensation transistor 310, a first cover layer 320 and a dam 290 are arranged on the non-display area NA of the display panel 10.

[0099]The dam 290 is formed to surround the outside of the display area AA and blocks a flow of the organic film 192 constituting the encapsulation film 190. Since the organic film 192 constituting the encapsulation film 190 has excellent covering performance but has low barrier performance, the organic film 192 should be encapsulated by the second inorganic film 193. However, if the area where the organic film 192 is to be formed overflows, water or oxygen may be permeated into the area through the organic film 192 exposed without b...

second embodiment

[0135]FIG. 7 is a detailed plane view illustrating a second embodiment of a non-display area of FIG. 2.

[0136]The non-display area NA shown in FIG. 7 is different from the non-display area NA shown in FIGS. 4 to 6 in that the first cover layer 320 has a rectangular form not a line form. Since the compensation transistor 310 and the dam 290 shown in FIG. 7 are the same as those shown in FIGS. 4 to 6, their description will be omitted.

[0137]The first cover layer 320 is arranged on the compensation transistor 310 of the non-display area NA. The first cover layer 320 serves to cover a step difference generated by the seventh contact hole CT7 of the compensation transistor 310.

[0138]The first cover layer 320 is arranged to overlap the seventh contact hole CT7 of the compensation transistor 310, whereby a groove generated by the seventh contact hole CT7 is filled with the first cover layer 320. If a plurality of seventh contact holes CT7 are provided, the first cover layer 320 may be patte...

third embodiment

[0147]FIG. 8 is a detailed plane view illustrating a third embodiment of a non-display area of FIG. 2, and FIG. 9 is a cross-sectional view illustrating an example taken along line I-I′ of FIG. 8.

[0148]The non-display area NA shown in FIGS. 8 and 9 is different from the non-display area NA shown in FIGS. 4 to 6 in that the first cover layer 320 has a circular form not a line form. Since the compensation transistor 310 and the dam 290 shown in FIGS. 8 and 9 are the same as those shown in FIGS. 4 to 6, their description will be omitted.

[0149]The first cover layer 320 is arranged on the compensation transistor 310 of the non-display area NA. The first cover layer 320 serves to cover a step difference generated by the seventh contact hole CT7 of the compensation transistor 310.

[0150]The first cover layer 320 is arranged to overlap the seventh contact hole CT7 of the compensation transistor 310, whereby a groove generated by the seventh contact hole CT7 is filled with the first cover lay...

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Abstract

A display device is disclosed, which may prevent an inorganic film formed in an organic film open area from being damaged and prevent a cathode electrode from being shorted. The display device includes a substrate including a display area on which pixels area arranged, and a non-display area surrounding the display area; a first metal layer formed in the non-display area of the substrate; at least one insulating film arranged on the first metal layer; a second metal layer arranged on the at least one insulating film and connected with the first metal layer through a contact hole that passes through the at least one insulating film formed in the non-display area; a cover layer arranged on the contact hole and formed to overlap the contact hole; and an encapsulation film formed to cover the display area and the cover layer.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of the Korean Patent Application No. 10-2017-0085234 filed on Jul. 5, 2017, which is hereby incorporated by reference for all purposes as if fully set forth herein.BACKGROUNDField of the Disclosure[0002]The present disclosure relates to a display device.Discussion of the Related Art[0003]With the advancement of the information age, a demand for a display device for displaying an image has been increased in various forms. Therefore, various display devices such as liquid crystal display (LCD) devices, non-self-light emitting display devices such as plasma display panel (PDP) devices, organic light emitting display (OLED) devices and electroluminescence display devices such as quantum dot light emitting display (QLED) devices have been used.[0004]Among the display devices, the organic light emitting display device and the quantum dot light emitting display device are self-light emitting devices, and have ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L29/08H01L27/32H01L51/52G09G3/3266G09G3/3275
CPCH01L27/3258H01L27/3248H01L27/3262H01L27/3265H01L27/3276H01L51/5212H01L51/5246H01L51/5253G09G3/3266G09G3/3275G09G2310/027G09G2310/0289G09G2310/08H01L2251/5392H10K59/131H10K50/8426H10K50/844H10K59/123H10K59/124H10K59/1213H10K59/1216H10K50/84H10K50/814H10K2102/341
Inventor PARK, JONGCHANKIM, JINHWANKIM, DO-YOUNGUM, HYUNCHULYUN, YEONGHO
Owner LG DISPLAY CO LTD